Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['n', '6945', '2579', 'N', '1493', '4571', '6009']

14, 6945, 2579, 14, 1493, 4571, 6009